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김현성,Dong-Pyo Han,Ji-Yeon Oh,심종인,신동수,류한열 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.11
The nonradiative recombination carrier lifetime in InGaN/GaN quantum wells was measured utilizing a time-resolved photoluminescence measurement. The lifetime was estimated from the final decay stage of the temporal response of the photoluminescence, which is closely related to the nonradiative recombination. The nonradiative recombination carrier lifetime estimated by using the given method showed of relative independence from the carrier density in the quantum well. A study comparing the nonradiative recombination carrier lifetime estimated by using the given method with the results of temperature-dependent photoluminescence and current-dependent electroluminescence measurements at room temperature we performed. This unique method can be very useful for measuring the nonradiative carrier lifetime with good accuracy within a short time.
김현성,김지영,황보진,우경남,박민규,박경필,안성호 대한신경집중치료학회 2020 대한신경집중치료학회지 Vol.13 No.1
Background: New-onset refractory status epilepticus (NORSE) refers to the newly established concept of a disease characterized by refractory status epilepticus without an identifiable etiology. Recent reports have indicated the importance of immunotherapy for NORSE. Case Report: A 37-year-old man with no past history of epilepsy was admitted for a presenting complaint of confusion. He was treated with acyclovir and anti-epileptic drug (AED) for presumed herpes encephalitis. However, he developed generalized tonic-clonic seizures on day 6 of admission that worsened despite treatment with multiple AEDs. NORSE was considered to be a probable diagnosis and immunotherapy with methylprednisolone and immunoglobulin was scheduled. However, persistent seizure activity was observed on the electroencephalogram after the completion of initial immunotherapy. Subsequently, rituximab was administered for 4 weeks. He eventually regained consciousness and was able to resume social activity. Conclusion: Our patient exhibited a favorable outcome with early-intensive immunotherapy and subsequent rituximab treatment for NORSE.
Robust Remote User Authentication Schemeusing Smart Cards
김현성,이성운 보안공학연구지원센터 2010 보안공학연구논문지 Vol.7 No.5
Two user authentication schemes were recently proposed using smart cards. They do not need to maintain a verification table in registration server, which is one of the good and necessary aspect in the password based schemes. In this paper, we show that they are not secure against some attacks. Then we propose a robust remote user authentication scheme to withstand the flaws in them but preserve the same merits of them. Our scheme could be efficiently used in wireless communication applications.
Desynchronization Attackon Hash-based RFID Mutual Authentication Protocol
김현성 보안공학연구지원센터 2012 보안공학연구논문지 Vol.9 No.4
A radio frequency identification (RFID) system is a promising automatic identification technology that uses communication via radio waves to identify and track moving objects. Privacy and security concerns inhibit the fast adaption of RFID technology for many applications. Although many EPCgen2 compliant protocols have been proposed in a quest to ensure security of low cost tags, still more the optimum security is not achieved as many protocols are found prone to well-known attacks. Recently, Cho et al. proposed a hash-based RFID mutual authentication protocol and the protocol is secure. However, this paper shows that Cho et al.’s protocol is weak against desynchronization attack and provides remedy for it.